Rockwell Automation 1790P-T4T0 CompactBlock LDX I/O Thermocouple Modules - Manual (Page 33)

Publication 1790-UM003A-EN-P
Module Data, Status, and Channel Configuration for DeviceNet 3-3
Over-Range Flag Bits (S8 to S11)
Over-range bits for channels 0 through 3 are contained in word 4, bits
8-11. When set (1), the over-range flag bit indicates a thermocouple
temperature that is greater than the maximum allowed temperature, a
resistance input that is greater than the maximum allowed resistance for
the module or an open channel is detected. The module automatically
resets (0) the bit when the data value is again within the normal operating
range.
Data Format Thermocouple/mV data is presented in engineering units x1. The
engineering units data format represents real temperature or voltage data
provided by the module. Thermocouple data is reported in either °C
or °F.
The module scales input data to the actual temperature values for the
selected thermocouple type per NIST ITS-90 standard. It expresses
temperatures in 0.1 degree units, either °C or °F, depending on which
temperature scale is selected. For mV inputs, the module expresses
voltage in 10uV units.
Negative temperatures are returned in 16-bit two’s complement binary
format. See Appendix B for a detailed explanation of two’s complement
binary numbers.
Table 3.3 RTD Data Format
Thermocouple
Input Type
Range
Data Format
Engineering Units x1
0.1°C 0.1°F
B -300 to +1800°C -3000 to +18000 -5720 to +32720
E -270 to +1000°C -2700 to +10000 -4540 to +18320
J -210 to +1200°C -2100 to +12000 -3460 to +21920
K -270 to +1370°C -2700 to +13700 -4540 to +24980
R -50 to +1768°C -500 to +17680 -580 to +32140
S -50 to +1768°C -500 to +17680 -580 to +32140
T -270 to +400°C -2700 to +4000 -4540 to +7520
N -270 to +1300°C -2700 to +13000 -4540 to +23720
Table 3.4 Resistance Data Format
Resistance Input Range
Data Format
Engineering Units x1
10uV -76.5 to +76.5mV -7650 to 7650